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https://issues.apache.org/jira/browse/CAMEL-4169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13101991#comment-13101991
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Claus Ibsen commented on CAMEL-4169:
------------------------------------
The Simple language now supports ++ and -- as an unary operator in Camel 2.9
onwards. So you can do
{code}
<setHeader headerName="myCounter">
<simple>${header.myCounter}++</simple>
</setHeader>
{code}
In terms of the other math operators. I wonder how much usable they are?
> simple calculations in route
> ----------------------------
>
> Key: CAMEL-4169
> URL: https://issues.apache.org/jira/browse/CAMEL-4169
> Project: Camel
> Issue Type: New Feature
> Components: camel-core
> Affects Versions: 2.7.2
> Reporter: Marco Westermann
> Assignee: Claus Ibsen
> Priority: Minor
> Fix For: Future
>
>
> create calculation possibilities in simple language. For example to increment
> a header property: ${header.counter}++
> example:
> from("direct:getLastValueFromCache")
> .transform().simple("${header.lastProcessedOrder}++")
> .to("direct:createNewOrderWithNewProcessingNumber");
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